The working principle of turbine flowmeter Posted by : admin / Posted on : Jul 09， 2021

The working principle of the turbine flowmeter: The fluid flows through the sensor housing. Because the blades of the impeller have a certain angle with the flow direction, the impulse of the fluid makes the blades have a rotating moment. After the friction torque and fluid resistance are overcome, the blades rotate, and the speed is stable after the torque is balanced. Under certain conditions, the speed is proportional to the flow rate. Because the blade is magnetically permeable, it is in the magnetic field of the signal detector (composed of permanent magnets and coils). The rotating blade cuts the lines of magnetic force and periodically changes the coil's The magnetic flux induces an electrical pulse signal at both ends of the coil. This signal is amplified and shaped by the amplifier to form a continuous rectangular pulse wave with a certain amplitude, which can be transmitted to the display instrument remotely to display the instantaneous flow and cumulative amount of the fluid. In a certain flow range, the pulse frequency f is proportional to the instantaneous flow Q of the fluid flowing through the sensor, and the flow equation is: Q=3600×f/k
Where:
f——pulse frequency [Hz];
k——The meter coefficient of the sensor [1/m], which is given by the calibration sheet. If the unit is [1/L], Q=3.6×f/k
Q——The instantaneous flow rate of the fluid (under working condition) [m3/h];
3600-conversion factor.
The meter coefficient of each sensor is filled in the verification certificate by the manufacturer, and the k value is set in the matching display instrument to display the instantaneous flow and cumulative total.